﻿using System;
using System.Collections.Generic;
using System.Linq;
using Artemis.Core.Modules;

namespace Artemis.Core.Services;

internal class DataModelService : IDataModelService
{
    public DataModelService(IPluginManagementService pluginManagementService)
    {
        // Add data models of already loaded plugins
        foreach (Module module in pluginManagementService.GetFeaturesOfType<Module>().Where(p => p.IsEnabled))
            AddModuleDataModel(module);

        // Add data models of new plugins when they get enabled
        pluginManagementService.PluginFeatureEnabled += OnPluginFeatureEnabled;
    }

    private void OnPluginFeatureEnabled(object? sender, PluginFeatureEventArgs e)
    {
        if (e.PluginFeature is Module module)
            AddModuleDataModel(module);
    }

    private void AddModuleDataModel(Module module)
    {
        if (module.InternalDataModel == null)
            return;

        if (module.InternalDataModel.DataModelDescription == null)
            throw new ArtemisPluginFeatureException(module, "Module overrides GetDataModelDescription but returned null");

        module.InternalDataModel.IsExpansion = module.IsAlwaysAvailable;
        RegisterDataModel(module.InternalDataModel);
    }


    public DataModelRegistration RegisterDataModel(DataModel dataModel)
    {
        if (dataModel == null)
            throw new ArgumentNullException(nameof(dataModel));
        return DataModelStore.Add(dataModel);
    }

    public void RemoveDataModel(DataModelRegistration registration)
    {
        if (registration == null)
            throw new ArgumentNullException(nameof(registration));
        DataModelStore.Remove(registration);
    }

    public List<DataModel> GetDataModels()
    {
        return DataModelStore.GetAll().Select(d => d.DataModel).ToList();
    }

    public T? GetDataModel<T>() where T : DataModel
    {
        return (T?) DataModelStore.GetAll().FirstOrDefault(d => d.DataModel is T)?.DataModel;
    }

    public DataModel? GetPluginDataModel(PluginFeature pluginFeature)
    {
        return DataModelStore.Get(pluginFeature.Id)?.DataModel;
    }
}